No, Israel is not eligible for Horizon Europe, as it has not signed the agreement with the European Union to become a third country associated to Horizon Europe. Therefore, legal entities from Israel cannot receive EU funding in Horizon Europe projects. However, according to the European Commission, Israel should become eligible by the end of 2021.
The list of participating Countries in Horizon Europe is available form the European Commission website and has been published on the 17th of June 2021. It lists all other countries eligible for Horizon Europe.